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Iterating over every two elements in a list
...lementation.
For Python 2:
from itertools import izip
def pairwise(iterable):
"s -> (s0, s1), (s2, s3), (s4, s5), ..."
a = iter(iterable)
return izip(a, a)
for x, y in pairwise(l):
print "%d + %d = %d" % (x, y, x + y)
Or, more generally:
from itertools import izip
def group...
What's wrong with overridable method calls in constructors?
... Wicket page class that sets the page title depending on the result of an abstract method.
7 Answers
...
Script parameters in Bash
I'm trying to make a shell script which should be used like this:
5 Answers
5
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Rotating a two-dimensional array in Python
...for the optimal solution I found this impressive one-liner that does the job:
7 Answers
...
Web colors in an Android color xml resource file
...
You have surely made your own by now, but for the benefit of others, please find w3c and x11 below.
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="white">#FFFFFF</color>
<color name="yellow">#FFFF00</c...
Java SafeVarargs annotation, does a standard or best practice exist?
...
1) There are many examples on the Internet and on StackOverflow about the particular issue with generics and varargs. Basically, it's when you have a variable number of arguments of a type-parameter type:
<T> void foo(T... args);
In Java, varargs are a syntactic sugar that undergo...
What is the difference between RegExp’s exec() function and String’s match() function?
...
exec with a global regular expression is meant to be used in a loop, as it will still retrieve all matched subexpressions. So:
var re = /[^\/]+/g;
var match;
while (match = re.exec('/a/b/c/d')) {
// match is now the next match, in arr...
How to print (using cout) a number in binary form?
I'm following a college course about operating systems and we're learning how to convert from binary to hexadecimal, decimal to hexadecimal, etc. and today we just learned how signed/unsigned numbers are stored in memory using the two's complement (~number + 1).
...
What is the best way to compute trending topics or tags?
...s Trends". There, you can see the topics which have the fastest growing number of mentions.
11 Answers
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The tilde operator in C
...
The ~ operator is bitwise NOT, it inverts the bits in a binary number:
NOT 011100
= 100011
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